How many hours does the pump have? High hours use may have the plunger control sleeves worn badly so equal delivery between cylinders cannot be held, cam bearing wear causing end float will cause governor trouble too. If low hours these should be OK. There is a sensitivety adjustment inside governor cover that can be adjusted also. Tractors usually set 8-10%, combines 5-7%, gensets 3%. If someone set it too close on regulation it will surge, and resetting low idle and bumper spring may not remove it completely.

Fire may have caused bumper spring damage, depending on how hot it became. Main governor spring in Bosch RSV governor is very heavy, aluminum cover would melt first. At least that's what I have seen in the past, with combine pumps anyway that were torched.

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